Hey guys...
Recently my car has been getting TERRIBLE gas mileage and ran lean on a dyno and now it smells like rotten eggs eveytime i drive it. Could a bad cat-conv. cause a loss in gas mileage and performance? What else can it cause?

 

The Kremlin has attacked ur car Igor...time to move back to Mother Russia...

 

you watch that mf**er

 

hmmmm that really answered my ?...but thnx

 

Are you getting any CEL at all? If so it may be an O2 sensor. You might want to check the O2 sensors, and the cat. The rotten egg would be from the cat. The car running lean on the dyno might be from an O2 sensor.

 

relax homie..i'm cool with Igor like that...

 

Nope havn't gotten any lights. I guess its time to go back to the dealer

 

Hey Igor, are u sure u were careful with that drill when you were hacking away at your lights?

 

Yes this time they turned out perfect

 

Sounds like you have a bad cat, you can either get a new OEM one(recommended) or a RT cat, others will tell you to get a testpipe. Its your call. Best of luck!
Jason

 

I would probobly go with the stock cat because it is under wntty...but thnx for the only reasonable answer

 

Igor, I take it you got an extended warranty?

 

actually nissan factory wntty is until 80k for emissions parts